George h



' (No Model.)

G; f1.1". SCHRAER sa H; P. KRAFT.

VALVE.

Patented Dec. 25, 1894.

` No. V524,392.`

Y F/G. 2.

INVE NTORS z il. w

:WITNESSES:

UNITED* STATES .PATENT OFFICE.

GEORGE F. SCI-IRADER AND HENRY PHILLIP KRAFT, OF'NEW YORK, N. Y.;

` SAID. KRAFT ASSIGNOR TO SAID SCHRADER.

VALVE.

SPECIFICATION forming part of Letters Patent No. 531,392, dated December25, 1894.

Appiicati'on'iea June s, 1394..Y

DER and HENRY PHILLIP KRAFT, citizens of Y the United States, residingin the city, county,

and State of New York, have jointly'invented certain new and useful`Improvements in Valves, of which the following is a specica' tion. l

This invention relatesl most particularly to ,valves for pneumatictires.

Our invention aims to provide a valve stem and head in-which the washerlwill-'be maintained rmly in position against either dis'l tortion orescape and without injurious compression, and such a stem 'and headwhich can be constructed easily and economicallyon the most diminutivescale required.

To this end in carrying out the preferred form of the invention weconstruct the stem and head as will be hereinafter described.

In the accompanying drawings Figure 1 is an axial section of a tirevalve supplied with our improved stem. Fig. 2 is a similar view' showingthe parts in the open position and the stem 'in elevation. Fig. 3 isaview of the stem, cup and washer separated. Fig. 4.

is an axial section of-a modified construction of valve provided withour improvements. Fig. 5 is an elevation ofthe stem and an axiallsection of the head and cup showing a modication in their construction,and Fig. 6 is an axial' section showing `another modification. Referringto Figs. 1to 3 inclusive let A represent the tubular valve body; B, theseat thereof; C, the inner valve chamber thereof; D, the valve stem ;-E,the`valve proper or head; 1

` F, the Washer; G', the spring beneath the head;

H, the bottom plug; I, the mouth or inlet duct of the valve; J, the nutengaging the stem K, the washer therefor, and L the outer face of thebodyAagainst which this washer bears. According to the preferred form ofour in'- vention the stem and head are constructed as shown in Figs. 1,2 and 3, the stem con-l sisting of a plain cylindrical body a, passingthrough the throat b of the seat B, a screw threaded outer end c, arecessed innerend d, asquare shoulder e between this recess and theportion a, a cylindrical enlargement f at bottompfgthe recess b, a wideiiat face g beserial No. 513,278. (No man neath this enlargement, and asolid body h, preferably coned on its under face beneath the face g andconstituting the lower' end of the stem vand-the backingof the head. Theheadv consistsof the lower end of the stem, and a cup shaped washer ifixed thereon. This Washer z' hasw a central perforation or aperture jpreferably cylindrical and fitting over the enlargement f of the stem,al Hat annular bottom Zc surrounding this aperture, and anannularvertical flange Z united to the bottom by a curve m. The bottomla of the 'cup seats on the face g, and then is fixed thereto by swagingor upsetting the enlargenient f over on the inner face of the bottom.This preferably makes an air tight, permanent and rigid connectionbetween the cup and body h. The Iiange Z is preferably cylndricaI, andwhenthe cup is xed tothe -stern this liange is nearly flush with the'top face of the washer F, and in the same plane l,with the shoulder e,as shown. Preferably the stemand the body h are formed on a singleintegral spindle. I i When the cup and stem are fixed together,

as shown in Fig. 1, they constitute a stern and head having an annular.washer chamber M,

the bottom of which is composed of the overset top of the enlargement f,the adjacent eX-: y 48o posed top face of the bottom lcofthecup, and theinner annular face of theflangeZ, for the outer side and bottom wallsofthe 'compartf inent, the shoulder e for the top of the com., partment,and the cylindrical wall of the re- I duced portion d of the stem forthe inner wall of the compartment. Into this compartment the washer F,which is a cylindrical disk of IOO tween the stem and the flange, andthis portion is engaged by the seat Bwhen the'valve is closed.

In operation the washer is compressed by the seat into the chamber Mwhen the valve is drawn tight, and makes a tight joint with the seat andwith the interior of the chamber, but is prevented from becomingdistorted. When the valve is open the washer resumes its normalposition. If the rubber adheres to the brass seat after prolongedclosure, it will be separated therefrom by the shoulder e when the valveopens. Should a washer become worn out it can be picked out of thecompartment by any suitable tool and a new one substituted.

In theconst-ruction of stems and heads of the character described theparts are so exceedingly small that itis impracticable to construct aone piece stem and piston in which the compartment M is turned out, andhence heretofore it has been necessary to dispense either with thecentral recess and shoulder or with the external flange.

Our invention permits the easy and economical construction of a stem andhead having these advantageous features. The stem can be readily turnedto the contour shown, and any drawn or stamped metal cup applied to it.The upsetting of the two metals to fix them together is easilyaccomplished. In the construction shown in Fig. 3 this is done byplacing a punch against the enlargement f and striking it down thereonwith sufficient force to cause the metal to flow over the adjacentportion of the cup.

It will be understood that the invention is not limited to theparticular construction set forth as the preferred form, nor to anyspecial construction of valve. On the contrary the two parts composingthe stem and head may be variously disposed as circumstances suggest,and the device as a whole may be employed with any valve. I

Fig. 4 shows a dilferent construction of valve in which the shelllettered A has a riveted cross bar H maintaining the spring Gl, and amodified construction of nut lettered K is fixed to the stem lettered Dby an enlargement N formed on the head of the latter. The other partsare substantially identical to those previously described.

Fig. 5 shows a stem and head in which the stem lettered D has a stillfurther reduced end n below its recess d, and the head lettered E is ofturned metal having integral flange f and a downwardly tapering body h',the latter having an axial hole o through which the end n of the stempasses, and at the bottom of which it is riveted to lock the partstogether.

Fig. 6 shows a stein lettered D3 having-beneath its recess d a conicalbody h3 and an enlarged end p, and the cup lettered t" consists of aseparate piece of thin drawn metal having a cylindrical flange f3 at thetop and a tapering body q which is spun in against the tapering body ofthe stem and held thereon by the enlargement p.

Either of these constructions are effective to provide a two piece stemand head having a washer compartmentwith side flanges and a topshoulderin which the Washer can be properly held.

What we claim isl. In a valve, a shell having anannular valve seat., athroat above said seat, and a chamber beneath said seat, in combinationwith a valve proper consisting of a stem having a screwthreaded outerend, a reduced portion inwardly of said seat, a shoulder between itsscrew threaded end and said reduced portion, an enlarged body beneathsaid reduced portion having a tapering under face at bottom, and anannular flange at top surrounding said reduced portion, a packing washerwithin said flange embracing the reduced portion of said stem beneaththe shoulder of the latter and engaging said seat when the valve isclosed, and a nut screwing on the end of said stem embracing theexterior of said shell and drawing said washer against said seat toclose the valve, all combined and arranged substantially as and for thepurpose set forth.

2. In a valve, a shell having au annular valve seat, a contracted throattherethrough, and an enlarged chamber at the inner side of said seat, incombination witha valve proper consisting of a stem and head, said stemhaving a screwthreaded outer end projecting through and beyond saidthroat, a reduced portion at the inner side of said seat, a shoulderbetween said reduced portion and its screwthreaded end, and an enlargedbody at its inner end beyond said reduced portion and within saidchamber, said stem and body all formed in one integral piece, a sheetmetal annular flange seated on and carried by said body opposite saidreduced portion, and an annular packing washer embracing the reducedportion of said stem bearing against the enlarged body thereof, embracedexternally by said sheet metal flange, and engaging said sheet when thevalve is closed, and a nut screwing on the end of said stem engaging theexterior of said casing and holding said valve proper seatedwhen thevalve is closed, all combined and arranged substantially as and for thepurpose set forth.

3. In a valve, a casing having an annular seat, a contracted throat, andan enlarged chamber, in combination with a valve proper consisting of astem and head, said stem having an outer screwthreaded end projectingthrough said throat, a reduced portion at the inner side of said throat,a shoulder between said reduced portion and outer end, an annularenlargement having an overhanging flange at the inner end of saidreduced portion, and a body at the inner end of said enlargement, allformed in one integral piece, a cup-shaped sheet met-al piece embracingsaid enlargement beneath the overhan ging flange thereof,

IOO

IIO

seating on said body and having an 'annular iiange opposite said reducedportion of said stem, and an annular packing Washer embracing saidreduced portion within theiange Yof said cup-shaped piece and engagingsaid seat, and' a nut screwing on the end of said stem and engaging theexterior of said shell for holding the valve closed, all combined andarranged substantially as and for the purpose set 4forth.

4. A valve stem and head consisting of the stem D of turned metal havinga screwthreaded end c, shoulder @reduced recess d,

enlargement f, top face g and body h, and aV metal cup t' having anaperture j fitting over vsaid enlargement, a bottom k engaging saidface, and annular iange Z opposite said recess d, said enlargementoverhanging said cup and thereby fixing it in position', and a rubberwasher seated in said recess and within' said ze flange.

In witness whereof We have hereunto signed our names in the presence oftwo subscribing witnesses.

cEoRGE H. E. soHRADER. HENRY PHILLIP KRAFT.

Witnesses:

GEORGE HrFRAsER, f THOMAS H. WALLACE.

